gdb/config/i386/tm-i386os9k.h

   1 /* Macro definitions for i386 running under BSD Unix.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
   3
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* Override number of expected traps from sysv. */
  20 #define START_INFERIOR_TRAPS_EXPECTED 2
  21
  22 /* Most definitions from sysv could be used. */
  23 #include "i386/tm-i386v.h"
  24
  25 /* 386BSD cannot handle the segment registers. */
  26 /* BSDI can't handle them either.  */
  27 #if 0
  28 #undef NUM_REGS
  29 #define NUM_REGS 10
  30 #endif 0
  31
  32 #undef REGISTER_NAMES
  33 #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
  34                          "esp", "ebp", "esi", "edi", \
  35                          "eip", "eflags", "cs", "ss", \
  36                          "ds", "es", "fs", "gs", \
  37                          }
  38
  39 #define DATABASE_REG    3               /* ebx */
  40 #undef DECR_PC_AFTER_BREAK
  41 #define DECR_PC_AFTER_BREAK 0
  42
  43 /* On 386 bsd, sigtramp is above the user stack and immediately below
  44    the user area. Using constants here allows for cross debugging.
  45    These are tested for BSDI but should work on 386BSD.  */
  46 #define SIGTRAMP_START  0xfdbfdfc0
  47 #define SIGTRAMP_END    0xfdbfe000
  48
  49 /* The following redefines make backtracing through sigtramp work.
  50    They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
  51    from the sigcontext structure which is pushed by the kernel on the
  52    user stack, along with a pointer to it.  */
  53
  54 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
  55    chain-pointer.
  56    In the case of the i386, the frame's nominal address
  57    is the address of a 4-byte word containing the calling frame's address.  */
  58 #undef FRAME_CHAIN
  59 #define FRAME_CHAIN(thisframe)  \
  60   (thisframe->signal_handler_caller \
  61    ? thisframe->frame \
  62    : (!inside_entry_file ((thisframe)->pc) \
  63       ? read_memory_integer ((thisframe)->frame, 4) \
  64       : 0))
  65
  66 /* A macro that tells us whether the function invocation represented
  67    by FI does not have a frame on the stack associated with it.  If it
  68    does not, FRAMELESS is set to 1, else 0.  */
  69 #undef FRAMELESS_FUNCTION_INVOCATION
  70 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
  71   do { \
  72     if ((FI)->signal_handler_caller) \
  73       (FRAMELESS) = 0; \
  74     else \
  75       (FRAMELESS) = frameless_look_for_prologue(FI); \
  76   } while (0)
  77
  78 /* Saved Pc.  Get it from sigcontext if within sigtramp.  */
  79
  80 /* Offset to saved PC in sigcontext, from <sys/signal.h>.  */
  81 #define SIGCONTEXT_PC_OFFSET 20
  82
  83 #undef FRAME_SAVED_PC(FRAME)
  84 #define FRAME_SAVED_PC(FRAME) \
  85   (((FRAME)->signal_handler_caller \
  86     ? sigtramp_saved_pc (FRAME) \
  87     : read_memory_integer ((FRAME)->frame + 4, 4)) \
  88    )
  89
  90 #define BELIEVE_PCC_PROMOTION 1